Debian 10 Security Advisory DLA-3157-1: BlueZ Vulnerability Risk to DoS

CVE-2019-8921

SDP infoleak, the vulnerability lies in the handling of a
SVC_ATTR_REQ by the SDP implementation of BlueZ. By crafting a
malicious CSTATE, it is possible to trick the server into
returning more bytes than the buffer actually holds, resulting in
leaking arbitrary heap data.

CVE-2019-8922

SDP Heap Overflow; this vulnerability lies in the SDP protocol
handling of attribute requests as well. By requesting a huge
number of attributes at the same time, an attacker can overflow
the static buffer provided to hold the response.

CVE-2021-41229

sdp_cstate_alloc_buf allocates memory which will always be hung in
the singly linked list of cstates and will not be freed. This will
cause a memory leak over time. The data can be a very large
object, which can be caused by an attacker continuously sending
sdp packets and this may cause the service of the target device to
crash.

CVE-2021-43400